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#ifndef nsJSUtils_h__
#define nsJSUtils_h__

/**
 * This is not a generated file. It contains common utility functions 
 * invoked from the JavaScript code generated from IDL interfaces.
 * The goal of the utility functions is to cut down on the size of
 * the generated code itself.
 */

#include "nsISupports.h"
#include "jsapi.h"
#include "nsString.h"

class nsIDOMEventListener;
class nsIScriptContext;
class nsIScriptGlobalObject;
class nsIPrincipal;

class nsJSUtils
{
public:
  static JSBool GetCallingLocation(JSContext* aContext, const char* *aFilename,
                                   PRUint32* aLineno, nsIPrincipal* aPrincipal);

  static nsIScriptGlobalObject *GetStaticScriptGlobal(JSContext* aContext,
                                                      JSObject* aObj);

  static nsIScriptContext *GetStaticScriptContext(JSContext* aContext,
                                                  JSObject* aObj);

  static nsIScriptGlobalObject *GetDynamicScriptGlobal(JSContext *aContext);

  static nsIScriptContext *GetDynamicScriptContext(JSContext *aContext);
};


class nsDependentJSString : public nsDependentString
{
public:
  explicit nsDependentJSString(jsval v)
    : nsDependentString((PRUnichar *)::JS_GetStringChars(JSVAL_TO_STRING(v)),
                        ::JS_GetStringLength(JSVAL_TO_STRING(v)))
  {
  }

  explicit nsDependentJSString(JSString *str)
    : nsDependentString((PRUnichar *)::JS_GetStringChars(str), ::JS_GetStringLength(str))
  {
  }

  ~nsDependentJSString()
  {
  }
};

#endif /* nsJSUtils_h__ */
